There's certain types of graffitti that I love and I'm fine with tags when you're signing art with them. I otherwise see them as the shitposts of the street art/graffitti world though XD
I do love the giant murals, think they make otherwise architecturally disinteresting buildings that much better.
Painting rubbish on people's property without permission is vandalism and it costs the owner money to remove or detracts from the business, home or suburb. I fail to see the point to be honest. Commissioned art like this one is different though.